Treatment of schappe thread bands of artificial silk, and apparatus therefor



Oct. 18, 1938. CAMPQLUNGHI 2,133,535

TREATMENT OF SCI-IAPPE THREAD BANDS 0F ARTIFICIAL SILK. AND APPARATUS THEREFOR Filed NOV. 26, 1935 Patented Oct. .18, 1938 2,133,535 I TREATMENT OF SCHAPPE THREAD BANDS OF ARTIFICIAL THEREFOR Giovanni Campolunghi,

SILK, AND APPARATUS Rome, Italy, assignor to Societa Anonima Minerva, Rome, Italy, a limited company of Italy Application November 26, 1935, Serial No. 51,702 In Italy November 26, 1934 7 Claims.

It is known that during the mechanical operation of the washing, sulphur removal, bleaching, reviving and dyeing of schappe bands of artificial silk fibers to be transformed into staple fibers,

these bands are conveyed through a row of containers which either contain the appr treating liquids or water to wash the same before or after the various treatments.

The schappe artificial silk band is conveyed into each bath by means of a pair of rollers, from the rotation of which it receives its movement, and which at the same time expresses the remainder of the water or bath liquid which remains in the band from the previous bath.

Under like conditions the efiect of a treating or washing bath on the schappe thread band is proportional to the time during which the band remains in the liquid, and the time depends on the length of the container and the rate of movement 20 of the band.

The subject of the invention is a process by which the action of these treating or washing baths is improved or. the time of treatment is shortened and which is characterized by the fact 25 that the band is moved during its passage through the bath container.

- Practical tests have shown that this movement enables the time of the action of the different baths to be considerably shortened, in so far as 30 it opens the fibers of the band which before were compressed through the pressure of the cylinders, thus facilitating the penetration of the liquid and also in so far as a quicker change of the parts of the liquid in contact with the band is produced,

35 the parts which have already exerted their action are more quickly replaced by fresh and active parts of the washing water or the solutions.

The practical advantage of the use of the moving devices is obviously due to the fact that with i 40 baths of the same length a greater quantity of band can be treated and washed on account of the higher rate of progress, or that with the same running speed of the band it enables the bath containers to be made shorter.

Finally the use of the devices for moving the bands has also been shown to be advantageous in the. dyeing of the band in the preliminary or final color tones, since the opening of the band by the movement facilitates dyeing as the particles 0 can more easily penetrate to the centre.

According to the invention various means can be used to produce the said movement of the band. Three types of such movements are described in the following examples with reference to the II drawing.

Figures 1 and 1a show in longitudinal section and cross section respectively a container with a bar moved in an arc.

Figures 2 and 2a show in a similar illustration a container with a bar moved vertically up and down.

In the drawing, l indicates the container, 2 the bath liquid, 3 are the cylinders which cause the band to move through the bath and at the same time press it, 4 are the iding rollers for the band in the bath, 5 is the schappe band of artificial silk, 6 and 6' are the additional moving devices according to the invention.

The device according to Figs. 1 and 1a consists of a bar 6 of convenient profile, which is arranged under theband 5 and which can swing about an axis lying over the band and parallel to the bar itself.

The tangent between the bar 6 and the band 5 must be at a somewhat-higher level than the tangent between the band 5 and the two adjacent guiding rollers 4.

The band 5 also takes along the bar 6 to a certain extent during its progress through the bath, on account of the friction and as the band forms a definite angle over the bar which increases with a great tension on the band, this simultaneousmovement lasts until the bar, under the increasing influence of the force of gravity and the pressure of the tensioned band, overcomes the frictional adhesion. The bar then swings back and the thread band lowers and its tension reduces so that the bar is then taken along again in its direction of progress, and thus the play between bar and band is repeated continuously. 1 a

The device according to Figs. 2 and &1 consists of any suitable apparatus ii which is either driven from the same power source as the cylinder 3 by means of a suitable transmission or from an individual power source, and which gives to the band 5, during the progress through the bath, an up and down movement transversely thereto, whilst the alternating tensioning and relaxing of the band produces the desired eifect as in the first case.

A third form of construction of the device according to the invention consists in that the two pairs of cylinders 3 which move and press out the band through the bath are moved at a speed which is periodically alternated, and out of phase in such a way that at the moment in which, for example, the pair of cylinders supplying the band in the bath is moving at its greatest speed, the other pair of cylinders is moving at its slowest speed and vice versa. The mean peripheral speeds of 65 the pair of cylinders are therefore the same so that the band is never stretched in the sense of an extension of the threads but only undergoes a periodic slackening and tautening in accordance with the change of speed of the pairs of cylinders, thus securing the desired movement in the bath.

What I claim is: Y

1. A process for improving the treatment of schappe bands of artificial silk in washing, sulphur-removing, bleaching, reviving and dyeing baths and the like, comprising passing the band substantially horizontally and substantially longitudinally thereof through the bath, and moving the ingoing and outgoing portions of. said band at periodically alternating rates of speed out of phase with each other, whereby an auxiliary substantially transverse movement is imparted to the intermediate portions of said band bands of artificial silk fibers, to be transformed into staple fibers, in washing, sulphur removing, bleaching, reviving and dyeing baths and the like, comprising passing the band through a bath container, and opening the band during its passage through the bath container by the action of an auxiliary up and down movement by which the band is alternately slowly tensioned and relaxed.

4. Apparatus for carrying out the process defined in claim 2, comprising a bath container, means for passing a band of artificial silk fibers longitudinally through the container, and means for opening the band by imparting thereto an auxiliary movement which alternately slowly tensions and relaxes the band.

5. Apparatus for carrying out the process defined in claim 3, comprising a bath container, means for passing a band of artificial silk fibers longitudinally through the container, and a pivotally mounted guide member over which said band passes on its way through container, the pivotally mounted guide member being actuated by the frictional contact between the bar and the band passing thereover, thus producing an auxiliary movement which alternately slowly tensions and relaxes "the band.

6. Apparatus for carrying out the process defined in claim 2, comprising a bath container, means for passing a band of artificial silk fibers substantially horizontally and substantially longi-.

tudinally thereof through the container, means for supporting the band adjacent its points of entry into and exit from said container, and means for opening the band by imparting thereto an auxiliary movement which alternately slowly tensions and relaxes the band during its passage through the bath, said last named means comprising a vertically-reclprocable guide member under which said band passes, and said guide member being arranged intermediate said points of entry and exit.

7. Apparatus for carrying out the process defined in claim 2, comprising a bath container, means for passing a band of artificial silk fibers substantially horizontally and substantially lonother, whereby an auxiliary substantially transverse movementis imparted to the intermediate portions of said band during its passage through the bath.

GIOVANNI CAMPOLUNGHI. 

